Question

我正在使自己成为Ruby中的任务列表并且收到此错误

You have created a new list
todo.rb:13:in `<class:List>': undefined method `add' for #<List:0xea5520>     (NoMethodError)
from todo.rb:9:in `<main>'

运行我的代码

class Task
   attr_accessor :description

   def initialize(description)
       @description = description
   end
end

class List
    def initialize(all_tasks)
        @all_tasks = []
        attr_accessor :all_tasks
    end
    def add(task)
            all_tasks << task
    end
    if __FILE__ == $0
        my_list = List.new
        puts 'You have created a new list'
        add(Task.new('Make tutorial video'))
        puts 'Added sample task to Todo List'
    end
end

我根据人们的建议改变了它，但我现在得到了这个

todo.rb:10:in `initialize': wrong number of arguments (0 for 1) (ArgumentError)
    from todo.rb:19:in `new'
    from todo.rb:19:in `<class:List>'
    from todo.rb:9:in `<main>'

我正在通过一个论证，不是吗？

Answer 1

尝试没有“my_list”的对象，就像这样

add(Task.new('Make tutorial video'))

Answer 2

我想你想要那样做

def add(task)  
  all_tasks << task
end

Answer 3

我在irb上尝试过以下操作，但它确实有用。

class Task
  attr_accessor :description

  def initialize(description)
    @description = description
  end
end

class List
  attr_accessor :all_tasks

  def initialize(all_tasks)
    @all_tasks = []
  end

  def add(task)
    all_tasks << task
  end

  my_list = List.new([1,2])
  puts 'You have created a new list'
  my_list.add(Task.new('Make tutorial video'))
  puts 'Added sample task to Todo List'
end

未定义的方法`add＆＃39; for＃<list：0xea5520>（NoMethodError）

3 个答案: